Reblooming Guide for Four Orchid Types: Phalaenopsis, Oncidium, Cattleya

Purchased discounted orchids: 2 Phalaenopsis, 1 Oncidium, 1 Cattleya. Healthy leaves, finished blooming (empty stalks). Asks about fertilizing and condition changes for rebloom.

Species-Specific Needs

Phalaenopsis differs entirely from Oncidium/Cattleya. Most orchids need controlled environments beyond typical homes—many discard after bloom.

Phalaenopsis (Easiest)

• Blooms ~1 month/year
• Bright indirect light (north/east windowsill)
• Optional: 2-6 hrs supplemental fluorescent (warm+cool tubes) after sunset in winter

Oncidium & Cattleya (Harder)

• More light, protected from late-day direct sun/heat (east or side of west window)
• Winter supplemental light more essential
• Night temps 50-55°F for rebloom (difficult in homes)

General Care

• Bark/sphagnum moss mix; pots with bottom AND side drain holes (not sealed decorative pots)
• Weekly sink flush with clear water; drip dry
• Water when top layer dry (~weekly); filtered/distilled if hard water
• Monthly 30-10-10 orchid fertilizer; switch to 10-30-10 pre-bloom
• 5-10°F night temp drop benefits all
• Phalaenopsis tolerates low humidity; others need humidifier/pebble tray in winter
• Repot every 2 years (bark breaks down); same pot size, fresh mix

Phalaenopsis most reliable for home rebloom; others challenging.

Additional Resources

Free Phalaenopsis care article by emailing wcreed@HorticulturalHelp.com. Comprehensive indoor plant care book also available for purchase.